but this photo was made with aps-c digital camera (eos 400d) so angle of view is simillar like with 50mm
i have 2 zeiss 50mm lenses - pancolar f1,8 and tessar f2,8 silver with pushed aperture ring

this looks more like a 50mm f1.4 than the 35mm f2.4 Flektogon ! In your technical details it says '50mm f1.4' !!! I use that Flektogon on my Pentax screw-thread and Praktica cameras.